Magnet-operated switch.



R. C. EMMERLING, J. H. WHEELOYCK 8; G. I. ROHLAND MAGNETOPERAIED swnCu.

APPLICATION FILED APR. 12, L916.

127L873. I Patented July 9, 1918.

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RUDOLPH C EMMERLIITG, JOHN l' i. WHEEL OGK, AND CURT J'. ROHLAN D, F WORCESTER,

MASSACHUSETTS, ASSIGNORS T0 AMERICAN MODEL AND INSTRUMENT COMPANY,

0F WORCESTER, MASSAGHUSZETTS, A CORPORATION OF MASSACHUSETTS.

MAGNET-OPERATED S'WITCH.

Application filed April 12,

- To all whom itm'ag concern:

Be it known that we, RUDOLPH Q. EM- MERLING, J 01m H. WHnnLocK, and CURT J. RonLANn, said EMMERLING .and NH-En- LOG-K citizens of the United States, said Ron- LAND being a citizen of the German Empire, all residing at Worcester, in the county of Worcester and State of lvl'assachnsetts, have invented a new and useful Magnet-Operated Switch, of which the following is a specification.

This invention relates to a switch or contact making device operated by an electromagnet. While capable of use with a direct current system, the invention is particularly designed for use with an alternating current, and the principal objects of the invention are to provide means of simple form and without complications whereby the current alternations will be prevented from causing chattering ofthe contact points and interruptions to the current passing through The spring is shown as in line with the pivot them.

Reference is to be had to the accompanying drawing, in which 1 Figure 1 is afront elevation of a preferred embodiment of this invention showing the contacts open, and j Fig. 2 is a similar view showing the contacts fully closed in full lines.

The invention is shown as applied for the purpose of closing current contact members 10 and 11. For this purpose an electromagnet 12 is shown provided with an armature 13 pivoted on a stud 14. This armature is provided with a projection 15 eatending from it. This projection is shown as located on the opposite side of the pivot. from the main body of the armature and is located in the plane thereof, the pivot being located at one side of this plane. This gives a good leverage and at the same time a sutiicient amplitude of movement.

Pivoted on an axis parallel with the first named axis, namely on a stud 20 is a rigid arm 21. This arm is provided with a notch 22 for receiving the end of said projection 15 at certain times as will appear. Secured on this arm is a flat brass spring 23 which is connected with one of the terminals 24 of the line which is designed to be completed by the contacting of the contact members 10 and 11.

Specification of Letters iatent.

1918. Serial No. 90,763.

'20. One of these members, as forexample,

10, is located at the end of this spring, and consequently is operated by the arm.

The operation of the device is as follows :lVhen there is no current inthe magnet coils the arm swings down by gravity and the end of the projection of the armature is located in the notch 22 which normally assists in keeping the main body of the armature away from the electromagnet. However, it will be observed that the armature is so balanced that it normally swings into this position without the aid of this arm. and moves against astop 25. Upon the ex citation of the electromagnet the armature is drawn to it about its pivot. This causes at first a comparatively rapid swinging motion of the arm 21 about its pivot until the end of the projection moves out of the notch 22. Just at that time the contact member 10 comes into contact with the contact member 11 and the circuit is closed. But the armature continues to swing toward the coils of alternating current can be used in this armaturewit-hont causing chattering at the contact points. This is broug'l1t about by the relative position of the parts as so far described and by the further fact that the arm 21 is located in a position not quite tancent to the are described by the projection 15 on the armature. It is moved away from it only slightly, but enough so that. the motion of the armature toua l the coils after its projection passes out of the notch will put further pressure on the arm and spring and force the arm back out of the normal position which it would assume from the action ot the spring alone. I In this way the vibrations of the armature are not transmitted to the contact members. in spite of the factthat. the armature itself is operated directly Without intermediate mechanism. Fig. 2 shows,

in full lines, the position of the parts just 55 I plane of the armature,

. While it shows, in dotted lines, the position when the armature is drawn up as near the magnet as it will go.

We have shown the parts in each position that gravity can be depended upon to open the contact but we do not wish to be limited to this.

Although we have illustrated and described only a single embodiment of the invention we are aware of the fact that many modifications can be made therein by any person skilled in theart without departing tuting the sole means for operating said movable arm in a direction to close the contact.

2. In an electromagnetic switch, the combination with two contact members, one of them movable into contact with the other, and an electromagnet having a pivoted armature, of a movable arm, a spring'extending from the arm and supportmg'said movable contact member, said. armature having a projection for engaging and operating said arm located in alinement with the main body of the armature and the pivot being located beyond the plane of the armature and projection.

3. In an electromagnetic switch, the combination with two contact members, of an electromagnet having a pivoted armature,

and a movable arm supporting one of said contact members, said armature having means for engaging and operating said arm located substantially in alinement with the main body of the armature and the pivot being located beyond the plane of the armature. 4. In; anelectromagnetic switch, the combination with an electromagnet having a pivoted armature, of an arm, a spring extending from the-arm and having a contact member thereon, said armature having a projection for engaging and operating said arm, the pivot being located beyond the and a parallel pivot near the first named pivot but on the side thereof opposite the armature and near the end thereof on which said arm is pivoted, said arm being I receiving said projection when the armature is not attracted toward the coils of the magnet.

5. In an electromagnetic switch, the combination with two contact members, one of.

the pivot therefrom, the

provided with a notch for them movable into contact with the other, and an electromagnet having a pivoted armature, of a pivoted arm; a flat spring extending fromthe arm and supporting said movable contact member, said armature having a projection'for engaging and operating said movable arm, said projection being located in alinement with the main body of the armature and on the opposite side of pivot being located beyond the plane of the armature, andthe arm being pivoted on a parallel pivot near the first named pivot but on the side thereof opposite the armature and near the end thereof and extending past the said projection, said arm being provided with a notch for receiving said projection when the armature is not attracted toward the coils of the magnet, whereby when the projection is moved out of the notch it holds the spring under tension;

6. In an electromagnetic switch, the combination with two movable arm supporting one of them and adapted to fall away from the other by gravity, and an electromagnet having an armature under said arm normally held toward but spaced from the electromagnet by gravity and provided with means thereon for engaging the under side of said movable arm' and forcing it up to bring said members into contact, said arm having means whereby when it falls it will hold'the armature farther away from the electromagnet against the force of gravity.

In an electromagnetic switch, the combination with two contact members, of a movable arm supporting one of them and adapted to fall away from contact with the other by gravity, and an electromagnet thereunder-having an upright pivoted armature independent of said arm provided with means thereon forengaging the bottom of said movable arm and forcing it up to bring said members into contact.

8. In an electromagnetic switch, the combination with an elcctromagnet having an upright pivoted armature, of an arm having a contact mem'ber thereon, said armature having a projection above its pivot for en gaging and operating said. arm, the pivot being located beyond the plane of the armature, and a parallel pivot near the first. named pivot but on the side thereof opposite the armature on which said arm is pivoted, said arm being provided with a notch for receiving said projection when the armature is not attracted toward the coils of the magnet.

9. In an electromagnetic switch, the combination with two contact members, one of them movable into contact with the other, and an electromagnet having an armature, of a movable arm supporting said movable contact member, and a cam surface contact contact members, of a tromagnet normally when the contact members are separated.

10. in. an electromagnetic switch, the

combination With two contact members, one of them movable into contact with the other, and an electromagnet having a pivoted armature, of a movable arm supporting one of said movable contact members, said armature having means for engaging and operating said arm located substantially in alinement With the main body of the armature and the pivot being located on the side of the armature opposite the electromagnet,

In testimony whereof We have hereunto set our hands.

RUDOLPH c. EMM amine. JOHN H. WHEELceK. CUB-T J. ROHLAND. 

